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<head>
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    <title>Document</title>
</head>

<body>
    <script>
        document.onkeydown = function (event) {
            var key = event.key
            console.log("啊？" + key)
        }
        var num = 0
        document.onkeyup = function (event) {
            var key = event.key
            if (key == "w") {
                num++
            }
            console.log("按啥呢按啥呢？" + num)
        }
    </script>
</body>

</html>